"Unexpected, I figured it was going to rain a little bit, but I wasn't expecting hail," said Adam Lipsky of Sonoma.

"I left for lunch, it was nice and sunny. I came back and it was like someone flipped a switch. It turned into a pretty crazy rainstorm on the way back," said Faruk Kugay, an employee at Sonoma Raceway.

Once the rain and hail storms moved on, the sun went down and the weather turned cold and windy.

Mitch Palma was working outside the Walmart in American Canyon, doing everything he can to stay warm.

"I have a couple layers of shirts underneath and then I'm wearing thermal pants and then two socks," he said.